package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal>
        implements SetmealService {
    @Autowired
    private SetmealService setmealService;
    @Autowired
    private SetmealDishService setmealDishService;

    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        //setmeal中取出套餐id,保存到每一个菜品id;
        //将每一个套餐的菜品的套餐id保存
        List<SetmealDish> collect = setmealDishes.stream().map((setmealDish) -> {
            Long id = setmealDto.getId();
            setmealDish.setSetmealId(id);
            return setmealDish;
        }).collect(Collectors.toList());
        setmealDishService.saveBatch(collect);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Override
    public void removeWithDish(List<Long> ids) {

         {
            //select count(*) from setmeal where id in (1,2,3) and status = 1
            //查询套餐状态，确定是否可用删除
            LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
            queryWrapper.in(Setmeal::getId,ids);
            queryWrapper.eq(Setmeal::getStatus,1);

            int count = this.count(queryWrapper);
            if(count > 0){
                //如果不能删除，抛出一个业务异常
                throw new CustomException("套餐正在售卖中，不能删除");
            }

            //如果可以删除，先删除套餐表中的数据---setmeal
            this.removeByIds(ids);

            //delete from setmeal_dish where setmeal_id in (1,2,3)
            LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
            //删除关系表中的数据----setmeal_dish
            setmealDishService.remove(lambdaQueryWrapper);
        }
    }
}

